Use standard icon/title in global error bubble

ui/views/widget/widget_delegate.h

Index: ui/views/widget/widget_delegate.h
diff --git a/ui/views/widget/widget_delegate.h b/ui/views/widget/widget_delegate.h
index 2219699940b0bde6d4f6a71995d16af2fc71d42d..41637cfdbfc72e2509b83e613efab12ceb1b5ed9 100644
--- a/ui/views/widget/widget_delegate.h
+++ b/ui/views/widget/widget_delegate.h
@@ -79,6 +79,12 @@ class VIEWS_EXPORT WidgetDelegate {
   // Returns true if the window should show a title in the title bar.
   virtual bool ShouldShowWindowTitle() const;
 
+  // Returns the icon to be displayed in the window title.
+  virtual gfx::ImageSkia GetWindowTitleIcon();

[msw, 2015/02/18 18:48:15]

Use GetWindowIcon and ShouldShowWindowIcon below instead.

[xiaoling, 2015/02/18 19:03:02]

Can I? Excellent if I can. What's the purpose of the WindowIcon? Will I break
something if I overload the meaning of that icon?

[msw, 2015/02/18 19:14:44]

You should definitely use those. They're already used for popup windows in
Chrome, perhaps app windows and more. Regardless, they're currently unused by
the BubbleDelegate[View] subclasses, and using them for this purpose (nearly
identical to the other window icons) is entirely reasonable.

+
+  // Returns true if the window should show an icon in the title bar.
+  virtual bool ShouldShowWindowTitleIcon() const;
+
   // Returns true if the window should show a close button in the title bar.
   virtual bool ShouldShowCloseButton() const;